That is just an excuse to drink. It is not a right brain or left brain philosophy... it is just an excuse to drink. Alcohol might help you lose your inhibitions enough to talk to a girl but it will only hurt any relationship you would have with one..... and has great potential to cause alcoholism which will only make you lose everyone that EVER liked you in the first place.
That isn't the only way. If he can get a girl while drinking, he can get one without drinking. The beer is just liquid courage. He needs to build a bit more self esteem and courage to talk to girls while sober.
It may seem like you can only get a girl if you are drinking,.but that is because the alcohol is speaking for you, at least it appears it is giving you the "strength" to talk. Do you even really WANT a girl you have to be drinking to talk to? Do you really want a girl who only will talk to you if you are drinking/drunk? I'm thinking THAT relationship won't go very far....you would sober up at some point and then what? You have to have a beer to say "Good Morning" to her?